big update: added reactions, groups, media share

server/internal/store/media.go

@@ -0,0 +1,62 @@
+package store
+
+import (
+	"context"
+	"errors"
+	"time"
+
+	"github.com/jackc/pgx/v5"
+)
+
+// Media stores metadata of an uploaded file. The file bytes live in the
+// media storage backend (see internal/media), referenced by StorageKey.
+type Media struct {
+	ID          int64
+	UploaderID  int64
+	Filename    string
+	ContentType string
+	Size        int64
+	StorageKey  string
+	ThumbKey    string
+	CreatedAt   time.Time
+}
+
+// CreateMedia inserts a media record and returns it with its ID.
+func (s *Store) CreateMedia(ctx context.Context, m Media) (*Media, error) {
+	err := s.pool.QueryRow(ctx, `
+       INSERT INTO media(uploader_id, filename, content_type, size, storage_key, thumb_key)
+       VALUES($1, $2, $3, $4, $5, $6)
+       RETURNING id, created_at
+   `, m.UploaderID, m.Filename, m.ContentType, m.Size, m.StorageKey, nullableString(m.ThumbKey)).Scan(&m.ID, &m.CreatedAt)
+	if err != nil {
+		return nil, err
+	}
+	return &m, nil
+}
+
+// GetMediaByID retrieves a media record or returns ErrNotFound.
+func (s *Store) GetMediaByID(ctx context.Context, id int64) (*Media, error) {
+	var m Media
+	var thumbKey *string
+	err := s.pool.QueryRow(ctx, `
+       SELECT id, uploader_id, filename, content_type, size, storage_key, thumb_key, created_at
+       FROM media WHERE id=$1
+   `, id).Scan(&m.ID, &m.UploaderID, &m.Filename, &m.ContentType, &m.Size, &m.StorageKey, &thumbKey, &m.CreatedAt)
+	if err != nil {
+		if errors.Is(err, pgx.ErrNoRows) {
+			return nil, ErrNotFound
+		}
+		return nil, err
+	}
+	if thumbKey != nil {
+		m.ThumbKey = *thumbKey
+	}
+	return &m, nil
+}
+
+func nullableString(s string) *string {
+	if s == "" {
+		return nil
+	}
+	return &s
+}